I am also having a similar error and Yes @djpaul it is the same Lines. I am also using custom fields but I have 3 groups, the group having the problem has only checkboxes and is a required field.
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Warning: trim() expects parameter 1 to be string, array given in C:xampphtdocsashantibar.orgwp-contentpluginsbuddypressbp-xprofile.php on line 717
Warning: Cannot modify header information – headers already sent by (output started at C:xampphtdocsashantibar.orgwp-contentpluginsbuddypressbp-xprofile.php:717) in C:xampphtdocsashantibar.orgwp-includespluggable.php on line 897
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